学习练习--UI界面实现个人所得税计算

@implementation AppDelegate

- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary
*)launchOptions
{
    self.window = [[UIWindow
alloc] initWithFrame:[[UIScreen
mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor
whiteColor];
    [self.window
makeKeyAndVisible];
    
    UILabel *welcomLb = [[UILabel
alloc]initWithFrame:CGRectMake(80,
20, 160,
50)];
    welcomLb.text =
@"个人所得税计算";
    welcomLb.textColor = [UIColor
greenColor];
    welcomLb.font =[UIFont
boldSystemFontOfSize:22];
    welcomLb.shadowColor = [UIColor
purpleColor];
    welcomLb.shadowOffset =
CGSizeMake(2,
2);
    welcomLb.textAlignment =
NSTextAlignmentCenter;
    [self.window
addSubview:welcomLb];
    
    //输入工资
    UILabel *salaryLb = [[UILabel
alloc]initWithFrame:CGRectMake(50,
70, 80,
40)];
    salaryLb.text =
@"工资：";
    salaryLb.textAlignment =
NSTextAlignmentLeft;
    [self.window
addSubview:salaryLb];
    
    salaryTF = [[UITextField
alloc]initWithFrame:CGRectMake(150,
70, 140,
40)];
    salaryTF.borderStyle =
UITextBorderStyleRoundedRect;
    salaryTF.placeholder =
@"请输入.......";
    salaryTF.keyboardType =
UIKeyboardTypeNumberPad;
    [self.window
addSubview:salaryTF];
    
    //个人所得税
    UILabel *taxOutLb = [[UILabel
alloc]initWithFrame:CGRectMake(50,
110, 80,
40)];
    taxOutLb.textAlignment =
NSTextAlignmentLeft;
    taxOutLb.text =
@"应缴税：";
    [self.window
addSubview:taxOutLb];
    
    taxOutTF = [[UITextField
alloc]initWithFrame:CGRectMake(150,
110, 140,
40)];
    taxOutTF.userInteractionEnabled =
NO;
    taxOutTF.borderStyle =
UITextBorderStyleRoundedRect;
    taxOutTF.placeholder =
@"应缴税......";
    [self.window
addSubview:taxOutTF];
    
    //实际工资
    UILabel *factSalaryLb = [[UILabel
alloc]initWithFrame:CGRectMake(50,
150, 80,
40)];
    factSalaryLb.text =
@"真工资：";
    factSalaryLb.textAlignment =
NSTextAlignmentLeft;
    [self.window
addSubview:factSalaryLb];
    
    factSalaryTF = [[UITextField
alloc]initWithFrame:CGRectMake(150,
150, 140,
40)];
    factSalaryTF.userInteractionEnabled =
NO;
    factSalaryTF.borderStyle =
UITextBorderStyleRoundedRect;
    factSalaryTF.placeholder =
@"实际工资是......";
    [self.window
addSubview:factSalaryTF];
    
    //两个按钮
    UIButton * calculateBtn = [UIButton
buttonWithType:UIButtonTypeSystem];
    calculateBtn.frame =
CGRectMake(60,
220, 80,
40);
    [calculateBtn setTitle:@"计算"
forState:UIControlStateNormal];
    calculateBtn.backgroundColor = [UIColor
groupTableViewBackgroundColor];
    [calculateBtn setTitleColor:[UIColor
grayColor]forState:UIControlStateNormal];
    [calculateBtn addTarget:self
action:@selector(calculateTax)
forControlEvents:UIControlEventTouchUpInside];
    [self.window
addSubview:calculateBtn];
    
    UIButton * taxOutBtn = [UIButton
buttonWithType:UIButtonTypeSystem];
    taxOutBtn.backgroundColor = [UIColor
groupTableViewBackgroundColor];
    taxOutBtn.frame =
CGRectMake(180,
220, 80,
40);
    [taxOutBtn setTitle:@"重置"
forState:UIControlStateNormal];
    [taxOutBtn setTitleColor:[UIColor
grayColor]forState:UIControlStateNormal];
    [taxOutBtn addTarget:self
action:@selector(resetAll)
forControlEvents:UIControlEventTouchUpInside];
    [self.window
addSubview:taxOutBtn];
    return
YES;
}

-(void)calculateTax{
    float salary = [[salaryTF
text]floatValue];
    if (salary !=
0) {
        float exSalary;
        float a,b,factSalary;
        if (salary <
7662) {
            exSalary = salary * ( 1 - (0.08 +
0.02 + 0.005 +
0.12));
        }else{
            exSalary = salary - (7662 *(0.08 +
0.02 + 0.005 +
0.12));
        }
        
        exSalary -= 3500;
        if (exSalary <=
0) {
            a = 0; b =
0;
        }else
if(exSalary <= 1500){
            a = exSalary * 0.03;
            b = 0;
        }else
if (exSalary <= 4500){
            a = exSalary * 0.1;
            b = 105;
        }else
if (exSalary <= 9000){
            a = exSalary * 0.2;
            b = 555;
        }else
if (exSalary <= 35000){
            a = exSalary * 0.25;
            b = 1005;
        }else
if(exSalary <= 55000){
            a = exSalary * 0.3;
            b = 2755;
        }else
if (exSalary <= 80000){
            a= exSalary * 0.35;
            b = 5505;
        }else{
            a = exSalary * 0.45;
            b = 13505;
        }
        factSalary = exSalary + 3500 -(a - b);
        taxOutTF.text = [NSString
stringWithFormat:@"%f",a - b];
        factSalaryTF.text = [NSString
stringWithFormat:@"%f",factSalary];
    }
}

-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
    [salaryTF
endEditing:NO];
    [taxOutTF
endEditing:NO];
    [factSalaryTF
endEditing:NO];
}
@end

实现了个人所得税和实际工资的计算

得到UITextField新用法
UITextField *tf = [[UITextField alloc]initWithFrame:CGRect(100,100,100,100)];

tf.userInteractionEnable = NO;//UITextField是否能读写

tf.keyboardType = UIKeyboardTypeNumberPad;//UITextField所触发的键盘类型

[self.window addSubview];

float a = [[tf text]floatValue];//获取tf中的float值

//重写系统方法，使键盘落下
-(void)touchesMoved:(NSSet *)touches withEvent:(UIEvent *)event{
[tf endEditing:NO];

}

复习:
UIView 和 UIButton小运用：view1-->view2   view1-->view3
//简单qq登录、注册页面（功能未实现，仅用于UIView之间跳转）

@implementation LHAppDelegate
-(void)logo{
    
    view1 = [[UIView
alloc]initWithFrame:CGRectMake(0,
0, 320,
480)];
    [self.window
addSubview:view1];
    //背景图
    UIImageView *bgIV1 = [[UIImageView
alloc] initWithFrame:CGRectMake(0,0,320,480)];
    bgIV1.image = [UIImage
imageNamed:@"1.jpg"];
    [view1
addSubview:bgIV1];
    
    //欢迎行
    UILabel *welcomeLb = [[UILabel
alloc] initWithFrame:CGRectMake(65,100,190,40)];
    welcomeLb.text =
@"QQ，丰富你的生活";
    welcomeLb.textColor =[UIColor
blueColor];
    welcomeLb.font = [UIFont
systemFontOfSize:20];
    [view1
addSubview:welcomeLb];
    
    //账号行
    UILabel *unameLb = [[UILabel
alloc] initWithFrame:CGRectMake(50,150,50,40)];
    UITextField *unameTf = [[UITextField
alloc] initWithFrame:CGRectMake(120,150,150,40)];
    unameLb.text =
@"QQ号：";
    unameLb.font = [UIFont
systemFontOfSize:14];
    unameTf.placeholder =@"请输入QQ号......";
    [view1
addSubview:unameTf];
    unameTf.borderStyle =
3;
    [view1
addSubview:unameLb];
    
    //密码行
    UILabel *upwdLb = [[UILabel
alloc] initWithFrame:CGRectMake(50,210,50,30)];
    UITextField *upwdTf = [[UITextField
alloc] initWithFrame:CGRectMake(120,210,150,30)];
    upwdLb.text =
@"密码：";
    upwdLb.font = [UIFont
systemFontOfSize:14];
    upwdTf.placeholder =
@"请输入密码......";
    [view1
addSubview:upwdTf];
    upwdTf.borderStyle =
3;
    [view1
addSubview:upwdLb];
    
    //登陆和注册行
    UIButton *loginBtn = [UIButton
buttonWithType:UIButtonTypeSystem];
    loginBtn.frame =
CGRectMake(115,
260, 50,
30);
    UIButton *regBtn = [UIButton
buttonWithType:UIButtonTypeSystem];
    regBtn.frame =
CGRectMake(205,
260, 50,
30);
    
    loginBtn.backgroundColor = [UIColor
blueColor];
    regBtn.backgroundColor = [UIColor
blueColor];
    
    [view1
addSubview:loginBtn];
    [view1
addSubview:regBtn];
    
    [loginBtn setTitle:@"登陆"
forState:UIControlStateNormal];
    [regBtn setTitle:@"注册"
forState:UIControlStateNormal];
    
    [loginBtn setTitleColor:[UIColor
blackColor] forState:UIControlStateNormal];
    [regBtn setTitleColor:[UIColor
blackColor] forState:UIControlStateNormal];
    
    [loginBtn addTarget:nil
action:@selector(login)
forControlEvents:UIControlEventTouchUpInside];
    [regBtn addTarget:nil
action:@selector(reg)
forControlEvents:UIControlEventTouchUpInside];
}
-(void)reg{
    [UIView
beginAnimations:nil
context:nil];
    [UIView
setAnimationDuration:1];
    [UIView
setAnimationDelegate:self];
    [UIView
setAnimationTransition:UIViewAnimationTransitionCurlDown
forView:self.window
cache:YES];
    [UIView
commitAnimations];
    
    view2 = [[UIView
alloc]initWithFrame:CGRectMake(0,
0, 320,
480)];
    [self.window
addSubview:view2];
    
    UIImageView *bgIV2 = [[UIImageView
alloc]initWithFrame:CGRectMake(0,
0, 320,
480)];
    bgIV2.image = [UIImage
imageNamed:@"2.jpg"];
    [view2
addSubview:bgIV2];
}
-(void)login{
    [UIView
beginAnimations:nil
context:nil];
    [UIView
setAnimationDuration:1];
    [UIView
setAnimationDelegate:self];
    [UIView
setAnimationTransition:UIViewAnimationTransitionCurlDown
forView:self.window
cache:YES];
    [UIView
commitAnimations];
    
    view3 = [[UIView
alloc]initWithFrame:CGRectMake(0,
0, 320,
320)];
    [self.window
addSubview:view3];
    
    UIImageView *bgIV3 = [[UIImageView
alloc]initWithFrame:CGRectMake(0,
0, 320,
480)];
    bgIV3.image = [UIImage
imageNamed:@"3.jpg"];
    [view3
addSubview:bgIV3];
}
- (BOOL)application:(UIApplication *)application didFinishLaunchingWithOptions:(NSDictionary
*)launchOptions
{
    self.window = [[UIWindow
alloc] initWithFrame:[[UIScreen
mainScreen] bounds]];
    // Override point for customization after application launch.
    self.window.backgroundColor = [UIColor
whiteColor];
    [self.window
makeKeyAndVisible];
    [self
logo];
    return
YES;
}